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These seven books were used during August-December 1917 by Archie D. Hoffman and an unidentified assistant for statistical records of numbered "E" experiments. Each experiment usually involved a set of printings of a disc. For each printing, there is information about the number of records inspected, the number and percentage of "O.K." records, and the problems with each discarded disc. The reasons given for discard include pull-outs, crushed edges, cracks, and rough spots. Some of the results in these books were transferred to books in Notebooks by Edison and Other Experimenters -- Disc Record Books, Nos. 1-26.